keyboard 에서 enter 키 누르면 키보드 숨기기

UITextField 의 경우

#pragma mark - UITextFieldDelegate

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

{

    if ([string isEqualToString:@"\n"]) {

        [self.view endEditing:YES];

    }

    return YES;

}

UITextView 의 경우

#pragma mark - UITextViewDelegate

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{

    if ([text isEqualToString:@"\n"]) {

        [self.view endEditing:YES];

    }

    return YES;

}

최상위 View Controller 가져오기

+ (UIViewController*)topMostViewController {

    UIViewController *topMostViewController = nil;

    

    UIViewController *rootViewController = [UIApplication sharedApplication].keyWindow.rootViewController;

    if ([rootViewController isKindOfClass:[UINavigationController class]]) {

        UINavigationController* navigationController = (UINavigationController*)rootViewController;

        topMostViewController = navigationController.visibleViewController;

    } else if (rootViewController.presentedViewController) {

        topMostViewController = rootViewController.presentedViewController;

    } else if ([rootViewController isKindOfClass:[UITabBarController class]]) {

        UITabBarController* tabBarController = (UITabBarController*)rootViewController;

        topMostViewController = tabBarController.selectedViewController;

    } else

        topMostViewController = rootViewController;

    

    return topMostViewController;

}